Moses h



(No Model.)

M. H. GOULDING.

SAW TOOTH.

1%. 532,371. Patented Jan. 8, 1895.

mmun-mumnmnmmum- IE STATES j PATENT FFICVE.

MOSES H. GOULDING, OF TRENTON, NEW JERSEY, ASSIGNOR TO THE AMERICAN SAW' COMPANY, OF SAME PLACE.

SAW-TOOTH.

SPECIFICATION forming part of Letters Patent No. 532,371, dated January 8, 1895..

Application filed August 28, 1894. $erial No. 521,538. (No model.)

To all whom it may concern:'

Be it known that I, MOSES H. GoULDING,'a

citizen of the UnitedStates, residingat Trenand other saws, the object of the invention inafter described and claimed.

In the annexed drawings illustrating my invention: Figure 1 is a view in elevation of a section of a saw-plate provided with my improved teeth. Fig. 2 is a sectional view on the line w a: of Fig. 1. Fig. 3 is an enlarged detail perspective view of one of the teeth.

. Similar letters of reference designate corresponding parts in the several figures of the drawings.

A denotes the saw-plate. In the edge thereof are cut suitably-shaped teeth-receiving recesses having the following form: The recess a is cut on the curve of a true circle and is equal in length to half of the circle 'or sub-' stantially so, the remainder of the circle being shown in dotted lines in Fig. 1. This recess a has an inverted V-shaped tongue 0. thereon. At the right hand end of recess a is a shoulder a formed by an abutment on the edge of plate A and against this shoulder a. the locking piece abuts when in its normal positiomin the recess. At the left hand end of recess a, there is an offset 1) which is either flat orslightly curved and is preferably cut on a line corresponding to the extension of one of the radii of the circle having the curvature of recess a as a part of its circumference. From the ofiset b leading to the edge of the saw-plate A, is another recess B, whose curve is an arc of a circle concentric with the circle to which the curve of recess abelongs, although being of greater radius. The recess B is provided with an inverted V-shaped' tongue b. The saw-plate at the outer end of the recess B, tapers to a point at E. At the inner end of recess B, the tongue I) is cut away and the curved notch b is formed which merges into the offset 12'.

C designates the tooth or hit. This is adapted to be located in the recess B. It has an inner endf which is curved or made flatwise or otherwise suitably-shaped to rest upon the shoulder 11'. Its rear side is providedv with the large shoulderD which is fiat or plain and springs at an angle .to the rear edge of the tooth. This rear edge is'provided with a V- shaped groove 0 extending from the shoulder D to a point near the endf, where alug F is formed by thecutting short or closing up of thelower end of groove 0. When the bit is in place, the groove 0 receives the tongue I) and the lug F engages the notch b thereby hanging the bit firmly in position in the recess B and preventing its withdrawal until the lug is disengaged. The front edge of the tooth C is provided with a V-tongue c which is similar in size and form to the tongue a of the recess a, and it connects with the said tongue at. The shank of the tooth or bit C which lies in the recess Bis of uniform width throughout and is curved to correspond with the curvature of recess B, and being of a width equal to the offset 1) its inner edge will be on the same true circle as that to which the recess a belongs when the bit 0 is in its normal position, as shown in Fig. 1. It is to be noted moreover that when the tooth or bit 0 is in its normal position, the shoulder D does not come in contact with the edge of'the saw plate, but there is a slight intervening G denotes the locking plate by means of which the bit is held in position. This looking piece has its rear edge shaped to a true circle corresponding to the circle of the tongues a and c. The circular edge of the piece G is provided with a V-shaped groove G. After the tooth O has been placed in position with its lug F engaging the notch 19 then the plate G is located in the recess, with its groove G engaging the tongue 0 and a. The piece G can easily be sprung into the recess and shifted through the same until one end comes close against the shoulder a When the locking-piece is in this position it will have an effectual bearing against the entire outer edge ofthe tooth shank and will consequently securely hold the tooth in its recess. This locking piece, or spring, will effectually hold the tooth'in place, even though it may not itself be firmlyseated, and a loosening of the spring will not also loosen the tooth, for the latter cannot be released until the spring is entirely removed from the plate, but the spring while it is being shifted alongits semicircular seat Will all the while be holding the tooth.

It will be observed that when a tooth is constructed and located as the tooth C, with a lug F engaging the notch b there is no possibility of its being withdrawn from the saw-plate so long as the locking piece G is in position. In many kinds of insertible'teeth the bit is sometimes drawn out of its socket when some extraordinary strain comes thereon. Sometimes a log or plank will spring and clamp the saw just like a vise and it then becomes necessary to run the log back in order to get it free, and in doing this the bits are sometimes caught by a log and pulled out of the saw. This cannot possibly occur however with my improved saw bit, because no matter how hard the log may kick when the saw is being run backward, the engagement of the lug F with the notch b is effectual to hold the bit within its socket.

Slight changes may be made in the exact construction and arrangement and proporder between the two recesses, said tooth-receiving recess having an indentation or notch, of the tooth or bit having the same width throughout and substantially equal in width to the offset of its recess from the other recess, and having at its inner end a lug engaging the indentation or notch, and the locking plate having its edge out on a true circle substantially corresponding to that of the semicircular recess and the outer edge of the tooth, substantially as described.

2. The combination with the saw-plate having the semi-circular recess, at one end of which is an abrupt shoulder, said recess having a tongue, and the tooth recess having a tongue and concentric with the first recess, from which it is offset by a shoulder, at the inner end of which recess is an indentation or notch, the tooth having the same width throughout, and substantially equalin width to the offset in order that its outer edge may be in the same circle as the semicircular recess, said tooth having a log engaging the aforesaid notch, and having also a rear groove engaging the tongue in the tooth recess, and a front tongue, which is in circle with the tongue of the semi-circular recess, and the locking piece curved on substantially the same circle as'the semi-circular recess, and tooth and having a groove that engages the tongues, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

MOSES H. GOULDING.

Witnesses:

ROBERT STACKHOUSE, CALEB F. PURDY. 

